#include <REGX52.H>

void Delay(unsigned int ms)	//@11.0592MHz
{
	unsigned char data i, j;

	while(ms--)
		{
			i = 2;
			j = 199;
			do
			{
				while (--j);
			} while (--i);

		}
}


void main()
{
//	unsigned char num = 0;
	while(1)
	{
		if(P3_1 == 0)
		{
			Delay(20);
			while(P3_1 == 0);
			Delay(20);

//			num++;
			P2 = ~(~P2 + 1);
			
		}
	}
}